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Bredol, Michael; Merikhi, J.

doi:10.1023/a:1004396519134

Cited by 269 publications

(123 citation statements)

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“…Its non-toxic nature and unique optical properties continue to increase its wide variety of applications [10]. Typical examples are in flat-panel displays, electroluminescence devices, IR windows [11,12], sensors, lasers, and ultraviolet-emitting diodes [13,14]. Due to its non-toxicity, zinc sulphide is now used in waste water treatment as a photocatalyst in the degradation of organic pollutants such as dyes, halogenated derivatives, and pnitrophenol [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Laser-assisted synthesis, and structural and thermal properties of ZnS nanoparticles stabilised in polyvinylpyrrolidone

Onwudiwe

Krüger

Jordaan

et al. 2014

Applied Surface Science

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Research Highlights-Zinc sulphide (ZnS) nanoparticles were synthesised by laser irradiation -The structural and morphological properties of the prepared samples were analysed -Larger particles were obtained by using Na 2 S instead of TAA as the sulphur source.-Phonon softening and line broadening of the peaks were observed -Size reduction occurred in the samples obtained from both sources Graphical Abstract AbstractZinc sulphide (ZnS) nanoparticles have been synthesised by a green approach involving laser irradiation of an aqueous solution of zinc acetate (Znac 2 ) and sodium sulphide (Na 2 S·9H 2 O) or thioacetamide (TAA) in polyvinylpyrrolidone (PVP). The structural and morphological properties of the prepared samples were analysed using a transmission electron microscope, TEM, a high resolution transmission electron microscope, HRTEM, X-ray diffraction, and Raman spectroscopy.The thermal properties were studied using a simultaneous thermal analyser (SDTA). Better dispersed and larger particles were obtained by using sodium sulphide (Na 2 S) instead of TAA as the sulphur source. X-ray diffraction (XRD) analyses and Raman measurement show that the particles have a cubic structure, which is usually a low temperature phase of ZnS. There were phonon softening and line broadening of the peaks which are attributed to the phonon confinement effect. The average crystallite size of the ZnS nanoparticles estimated from the XRD showed a reduction in size from 13.62 to 10.42 nm for samples obtained from Na 2 S, and 9.13 to The absorption spectra showed that the nanoparticles exhibit quantum confinement effects.

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Section: Introductionmentioning

confidence: 99%

Laser-assisted synthesis, and structural and thermal properties of ZnS nanoparticles stabilised in polyvinylpyrrolidone

Onwudiwe

Krüger

Jordaan

et al. 2014

Applied Surface Science

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“…2 It has a wide range of applications for flat-panel displays, optical sensors, IR windows, catalysts, lasers, etc. [3][4][5] Shape and structure are crucial factors in determining the chemical, optical, and electrical properties of these materials. 6,7 Thus, one of the most important goals of modern materials research is the development of simple chemical methods for large scale synthesis of nanomaterials with full control of defects and morphology and, in this context, a considerable variety of methods has been reported for the synthesis of ZnS nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical studies on the enhanced photoluminescence activity of zinc sulfide with a capping agent

Santana

Raubach

Ferrer

et al. 2011

Journal of Applied Physics

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The photoluminescence (PL) emission from zinc sulfide (ZnS) synthesized by the microwave-assisted solvothermal method in the presence/absence of a capping agent was examined to understand the key role of its PL activity. In addition, we also investigated the electronic structure using a first-principle calculation based on density functional theory (DFT) applied to periodic models at BÁLYP level. Two models were selected to simulate the effects of structural deformation on the electronic structure; the ordered o-ZnS model and the disordered d-ZnS model, dislocating the Zn atom, 0.1 Å , in the z-direction. The PLemission in the visible region showed different peak positions and intensities in capped and uncapped ZnS. The PL emission was linked to distinct distortions in lattices and the emission of two colors, green in the capped and blue in the uncapped, was also examined in the light of favorable structural and electronic conditions. The computational simulations indicate that the electronic behavior can be associated with the new electronic levels above the valence band.

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“…For instance, ZnS (with a direct bandgap of 3.7 eV at room temperature) films have been applied as efficient phosphor and electroluminescence media in cathode-ray tubes, flat-panel displays, and IR windows. [34,35] Recently, various ZnS nanostructures, including nanowires and nanoribbons with controlled phase composition, and other micrometer-sized diskettes have been reported, wherein the deposition temperature is demonstrated to be a dominant factor. [36] Lasing at room temperature was achieved in individual ZnS nanoribbons, which serve as both the active (gain) and the optical confinement medium (resonant cavity and waveguide).…”

mentioning

confidence: 99%

Homoepitaxial Growth and Lasing Properties of ZnS Nanowire and Nanoribbon Arrays

et al. 2006

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Arrays of one-dimensional nanostructures (nanowires, nanorods, or nanotubes) are potential building blocks for electronic and optoelectronic nanodevices, such as sensors, laser diodes, field-effect transistors, and light-emitting diodes. [1][2][3][4][5] Quasi-vertically aligned growth of ZnO nanorods and carbon nanotube arrays have been obtained on various substrates by vapor-liquid-solid (VLS) and vapor-solid (VS) processes with the assistance of gold, tin, germanium, or iron catalysts. [6][7][8][9][10] In those growth processes, the catalyst particles initiate and guide the preferential orientation of nanostructures in specific crystallographic relations with respect to the substrates. Aligned nanostructures were also obtained by metal-organic chemical vapor deposition, [11] template-assisted growth, [12] and electrical-field alignment [13] without the assistance of catalysts. Due to the anisotropic properties such as electrical conductivity and band structure along the different orientations of semiconductor materials, control over the growth direction of nanostructures is an important factor desirable to tune the physical properties of nanostructures. To achieve nanostructure arrays with controlled orientation, epitaxial growth is a promising approach. Epitaxial growth of semiconductor nanowires, quantum wells, and dots on silicon substrates has shown great potential in the fabrication of new-generation optoelectronic devices.[ [20] and III-V compounds, such as GaN and InN, [21] have been prepared via homoepitaxy. Aligned Si or Si/Ge nanowires have been produced homoepitaxially on Si substrates using a gold thin film or nanoparticles as catalyst, [22][23][24] while III-V nanowires homoepitaxially grown on III-V substrates have also been achieved. [25] Very recently, epitaxy along the radial and axial directions of 1D nanostructures has led to interesting functional structures in a single wire or ribbon, e.g., group III-V heterojunctions (GaAs/GaP and InAs/InP nanowires), group IV heterojunctions (Si/Ge nanowires), Si/Ge core-shell nanowires, and NiS/Si, In/Si and Si-ZnS(Se) nanowires. [26][27][28][29][30][31][32] While much research has been devoted to the controlled growth and epitaxy of III-V nanostructures, few studies have been made on II-VI materials.[33] Similar to III-V semiconductors, group II-VI materials have attractive optical properties, such as wide bandgaps (direct), for optical devices in the short wavelength range, such as light-emitting diodes and laser diodes in ultraviolet and visible regions. For instance, ZnS (with a direct bandgap of 3.7 eV at room temperature) films have been applied as efficient phosphor and electroluminescence media in cathode-ray tubes, flat-panel displays, and IR windows. [34,35] Recently, various ZnS nanostructures, including nanowires and nanoribbons with controlled phase composition, and other micrometer-sized diskettes have been reported, wherein the deposition temperature is demonstrated to be a dominant factor. [36] Lasing at room temperature was achieved in...

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Untitled

Cited by 269 publications

References 7 publications

Laser-assisted synthesis, and structural and thermal properties of ZnS nanoparticles stabilised in polyvinylpyrrolidone

Laser-assisted synthesis, and structural and thermal properties of ZnS nanoparticles stabilised in polyvinylpyrrolidone

Experimental and theoretical studies on the enhanced photoluminescence activity of zinc sulfide with a capping agent

Homoepitaxial Growth and Lasing Properties of ZnS Nanowire and Nanoribbon Arrays

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